Improve the highlighted part of the sentence given below.
No one could explain how a calm and balanced person like him could $penetrate$ such a mindless act on his friends.

Improve the highlighted part of the sentence given below.
Practically $every\, part$ of the banana tree is used by man.

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They are social insects, $living\, in\, communities$, regulated by definite laws, each member of society bearing a well-defined and separate part in the work of a colony.

Improve the highlighted part of the sentence given below:
$I$ would have waited for you at the station if $I$ $knew$ that you would come.

Improve the highlighted part of the sentence given below.
My $opinion\, for$ the film is that it will bag the national award.

Improve the highlighted part of the sentence given below.
He found a $wooden\, broken\, chair$ in the room.